Phonogram-blank



(No Model.) I

T. A. EDISON.

PHONOGRAM BLANK. l l No. 382,418. 8 Patented. May 8,1888.

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SPECIFICATION forming part of Letters Patent No. 382,418, dated May 8, 1888.

Original application filed November 26, 1887, Serial No. 256,159. Divided and this application filed Mar-:11 2, 1888. Serial X0. 265,889. (No model.)

To all whom it may concern:

Be it known that I, THOMAS A. EDISON, a citizen of the United States, residing at Llew: ellyn Park, in the county of Essex and State of New Jersey, have invented a certain new and useful Improvement in Phonogram-Blanks and Phonograms, (Case No. 762, division of Case No. 74A,) of which the following is a specification.

The object I have in view is to produce a cylindrical phonogranrblank or phonogram which can be readily placed upon the phonogram'cylinder ofa ph0nograph,and will center itself, and will also be adapted to retain its place'upon the phonogram-cylinder by friction alone. This 1 accomplish by providing the cylindrical phonograin-blank or phonogram with a tapering bore adapted to fit over a similarly-tapered phonogram-cylinder. The phonogram blank or phonogram is provided with a cylindrical recording-surfiice. Blanks or phonograms of the full length of the tapering phonogram-cylinde'r of the phonograph can be used as well as those of shorterlength,

1 the tapering bore centering the blank or phonogram, and adaptingitto be pushed onto the phonogram-cylinder until it binds thereon with sufficient friction to hold it in place.

In the accompanying drawings, forming a part hereof, Figure 1 is a sectional view of a phonogranrblank or phonogram, showing by dotted lines its division into sections; and Fig. 2 an elevation, showing four different sizes of the phonogram-blank or phonogram.

P represents phonogram-blanks or phonograms. They have a cylindrical recordingsurface, 3, made of wax, or a wax-like substance, which-m'ay be mounted upon a backing, r, which is also a cylinder, but has a tapering bore adapted to fit upon asimilarlyda pered phouogram-cylinder of a phonograph.

I propose to make these phonogram-blanks the entire length of the phonogram-cylinder, and also to divide such fulllength phonogranr blanks into parts,so that sectional pho'nogramblanks will be produced, which will be, for illustration, onefourth, onehalf, and threefourths the length of the full-size phonogramblanks. All of these sectional phonogramblanks, as well as the full-sized phonograinblank, will have the taperingbore, so that they can be pushed upon the tapering phonogram-cylinder until they bind,and the instrument can then be adjusted to them for recording and reproducing.

I do not claim herein a phonogram -'blank having a recordingsurface of wax, or a waxlike material,nor such asurface mounted upon backing of tougher material, such matters being covered by my application for patent, (Case No. 734, Serial No. 252,964,) filed October 21, 1887.

What I claim is l. Aphonogranrblank or phonogram having a bore tapered throughout its length, sub stantially as set forth.

2. A phonogram blank or phonogram having a cylindrical recording surface and a tapering bore, substantially as set forth.

3. A phonogram-blank or phonogram hav ing a cylindrical recording-surface of wax or wax-like material and provided with a tapering bore, substantially asset forth.

This specification signed and witnessed this 20th day of February, 1888.

WILLIAM PELZER, E. ROWLAND, 

